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+#Copyright (c) 2009-11, Walter Bender
+
+# This procedure is invoked when the user-definable block on the
+# "extras" palette is selected and expanded to 3 arguments.
+
+# Usage: Import this code into a Python (user-definable) block.
+# First, expand the Python block to reveal three numerics arguments.
+# Set these values to the desired red, green, and blue. When the code
+# is run, the red, green, and blue values are used to set the pen
+# color.
+
+
+def myblock(tw, x):
+ ''' Add start group to SVG output '''
+
+ tw.svg_string += '<g>'
+